Effect of substrate curvature on residual stresses and failure modes of an air plasma sprayed thermal barrier coating system |
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| Authors: | D Liu M Seraffon PEJ Flewitt NJ Simms JR Nicholls DS Rickerby |
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| Affiliation: | 1. Interface Analysis Centre, University of Bristol, Bristol BS2 8BS, UK;2. Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, UK;3. Cranfield University, Cranfield, Bedford MK43 0AL, UK;4. National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK;5. School of Physics, HH Wills Laboratory, University of Bristol, Bristol BS8 1TL, UK;6. Rolls-Royce plc, Derby DE24 8BJ, UK |
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| Abstract: | A set of aerofoil shaped air plasma sprayed thermal barrier coated (APS-TBC) specimens were adopted in this paper to investigate the stress distributions in the ceramic top coat (TC) and the thermally grown oxide (TGO), the mechanism of local crack generation and propagation at the TC/BC (bond coat) interface. The failure mode of the TBC system, the distribution of asperities at TC/BC interface, thickness of the TC and BC, and the TC microstructure were found to be influenced by substrate curvature. Residual stress was therefore measured across the thickness of the TC, along the undulating TGO and mapped at locations of asperities where failure tended to occur to interpret the initiation of local failure. The role of the TGO was investigated via its chemical bonding with the TC and the decohesion occurring at the TGO/BC interface. The crack propagation at the interface has been discussed with respect to the macro-failure of the TBC system. |
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| Keywords: | Air plasma sprayed thermal barrier coating Substrate curvature Residual stresses Interfacial failure modes |
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